CameraHAL: Remove preview workaround for front camera

This workaround is no more needed since the mirroring flip
has been removed on kernel side.
CameraHAL: Remove not used code and unuseful commented code
CameraHAL: Fix photo portrait rotation for front camera

If the current mode is not video recording and the rotation
is a portrait rotation (eg. 90, 270, etc), add 180 degree to
fix the rotation of the taken photo.